Buffer tube



FIG. 1 is a front isometric view of the buffer tube embodying the new design.

FIG. 2 is a rear isometric view thereof.

FIG. 3 is a bottom view thereof.

FIG. 4 is a top view thereof with the opposite side view being a mirror image thereof.

FIG. 5 is a front view thereof.

FIG. 6 is a rear view thereof; and,

FIG. 7 is a side view thereof with the opposing side view being a mirror image thereof.

The broken lines represent portions of the buffer tube that form no part of the claimed design. 

CLAIM The ornamental design for a buffer tube, as shown and described. 